What is the difference between a frequency converter and a regular motor
The converter is a power control device that transforms the power supply into another frequency by using the power semiconductor device. We now use the frequency converter mainly adopts cross - straight - to pay way (VVVF inverter or vector control frequency conversion), the power frequency ac power first through the rectifier converts dc power supply, and then to convert the dc power supply frequency, voltage control of the ac power supply electric motor. The circuit of the converter is composed of rectifying, intermediate, inverter and control. Rectifying section for the three-phase bridge controlled rectifier, inverter part for IGBT three-phase bridge type inverter, and the output of PWM waveform, intermediate dc link for filtering, dc energy storage and buffer reactive power. Frequency changer: When selecting the frequency converter, make sure the following points: 1) the purpose of conversion; Constant pressure control or constant flow control. The type of load of the converter; The performance curve, such as a vane pump or a volumetric pump, is a special attention to the performance curve of the load, which determines the method of the application.
The most common frequency conversion motor for conversion motor and general motors is mandatory cooling, and ordinary motor is self-cooling. The conventional motor will be able to add a frequency converter, but be aware of its cooling and other problems
Frequency conversion motor has great capacity of overload high mechanical strength, wide range of speed and running stability, the characteristics of general motor rated voltage is 380 v, rated frequency 50 hz, can within the scope of 3 hz ~ 100 hz continuous speed! The other converter motor has a special cooling fan!
The silicon steel of the converter motor is higher than the silicon steel of the ordinary motor, so the eddy current loss at high frequencies is much smaller
Almost. The heat is different. High frequency, with a good shaft and heavy load
